Double stranded cotton refers to a fabric made by weaving two strands of cotton yarn simultaneously, which is usually thicker and stronger than single stranded yarn. Pure cotton refers to the fabric made entirely of cotton fibers. Humidity balance. Pure cotton fibers can absorb moisture into the surrounding atmosphere, with a moisture content of 8-10%. They feel soft and not stiff when in contact with the skin. If the humidity increases and the surrounding temperature is high, all the water contained in the fibers will evaporate and dissipate, keeping the fabric in a water balance state and making people feel comfortable.